It doesn't have amazing use for just running mobs, but it is an absolute Boss Slayer.
I enjoy using it as a way to tell how good ive been sniping while just running through mobs, lol. The 6 or so seconds you get before stacks start decaying doesn't feel nearly as short as people make it out to be, and one stack per second after that ain't bad. Plus, 6 seconds is how long deception lasts, so its easy to line up a shot without losing damage if you need to pop into deception.
Even at only 5 stacks, you are getting a boost thats pretty much as good as any other 5/5 skill in skill trees.
Its insane how many buffs and boosts Zer0 has stacking on top of each other towards endgame. its really quite ridiculous.
I'm really starting to like Zer0, you can do a lot of cool stuff with his character, I'll probably end up running a Shotgunning Melee Zer0 (No other character has a skill that improves accuracy like Zer0, which is crazy good with shotguns).
But anyway, I just wanted to show my love for this under appreciated skill. --- http://www.last.fm/user/BigRobb/